Automatic stop for sound-reproducing machines



0. 0. STORLE.

AUTOMATIC STOP FOR SOUND REPRODUCING MACHlNES.

' APPLICATION FILED APR. 16, 1919- 1,330,559. Patented Feb. 10,1920.

OLE O. STOBLE, 0F TACOMA, WASHINGTON.

AUTOMATIC STOP FOR SOUND-REPBODUCING MACHINES.

Specification of Letters Patent.

Patented Feb. 10, 1920.

Application filed April 16, 1919. Serial No. 290,510.

To all whom it may concern:

Be it known that I, OLE O. SToRLE, a c1t1- zen of the United States, residing at Tacoma, in the county of Pierce and State of Washington, have invented certain new and useful Improvements in Automatic Stops for Sound-Reproducing Machines, of which the following is a specification, reference being had to the accompanying drawing, forming a part thereof.

This invention relates more particularly to sound reproducing machines in which a movable stylus or needle traces spiral grooves in rotating records.

The main objects of the invention are to automatically stop machines of this class when the stylus reaches the ends of records of diiferent lengths; to avoid the necessity, care and trouble of setting or adjusting the stop mechanism for different records; and generally to increase the utility and con venience and to improve the construction and operation of devices of this class.

The invention is applicable to machines offndiflerent kinds and makes, and consists in the construction, arrangement and orgahization of elements as hereinafter particularly described and pointed out in the claims.

In the acompanying drawing like characters designate the same parts in the several figures.

Figure 1 is a plan view of stop mechanism as applied to a sound reproducing machine of the gramophone type, parts of the mechanism being broken away and shown' in section; Fig. 2 is a vertical section on the line 2-2, Fig. 1; Fig. 3 is a plan and sectional view showing parts of the stop mechanism and associated parts of aramophone, with the brakeset or applie Fig. 4 is a vertical section generally indicated by the line 4-4, Fig. 1; and Fig. 5 is a vertical section generally indicated by the line 5-5, Fig. 1.

Referring to Figs. 1 and 2 of the drawing, 1 designates the top board or plate of a gramophone, to the under side of which the motor (not shown) is usually fastened, and which is usually hinged or pivoted to facilitate access to the motor for oiling, inspection and repairs; 2 is a turn table removably mounted on the upper end of a vertical spindle 3, which pro ects upwardlythrough an opening in the board or plate 1; 1 is a horizontally swinging tone arm or stylus carrying arm; and 5 is the tracingstylus or needle, all of which are or may be, of the usual well known construction.

The stop mechanism comprises a brake, consisting of an angular lever 7 provided at one end with a pad or shoe 8, of rubber or other suitable material adapted to be shifted into and out of engagement with the inner side of the depending rim of the turn table 2. The lever 7 is fulcrumed on a pivot pin or stud 10, projecting upwardly from a base plate 11, which is fastened to the upper side of the board or plate 1. A detent 1 1, 1s pivotally connected with the lever 7 at the end opposite the brake shoe or pad 8, and is formed or provided adjacent its free end, with a projection 15, extending downwardly through a slot 16 in the plate 11. The slot 16 is offset adjacent the end nearest the lever 7, and forms a shoulder with which the projection 15 engages to lock and hold the brake in its off position, as .shown in Fig. 1.

A spring 18, connected at one end with an upwardly projecting lug on the detent 14 adjacent its free .end, and at the other end with a stud on the plate 11, tends to hold the detent in engagement with the shoulder in the slot 16, and when the detent is disengaged and released, to apply the brake to the rim of the turn table, as shown in Fig. 3.

A manually operated controlling lever 20, fulcrumed on the stud 10 of the lever 7, is provided with a downwardly projecting lug 21, which by engagement with the lever 7 shifts the brake shoe or pad 8 out of engagement with the rim of the turn table when the outwardly projecting handle arm of the lever 20 is turned by the operator to the right. as shown in Fig. 1. The lever 20 is formed or provided with an arm 22, which is adapted by engagement with an upwardly projecting lug 23 on the detent 14 adjacent its free end. to disengage the detent from the shoulder in the slot 16, and thereby release and permit the application of the brake by the spring 18 when the handle arm of the lever 20 is turned by the operator to the left, as shown in Fig. 3, the

' controlling lever 20 being capable of :1 limited movement independently of the brake lever .74, suflicient. to disengage. the detent.

and release the brake lever with the initial movement of the handle arm of the control ling lever to the left.

A longitudinally reciprocatory and a laterally oscillatory brake releasing hook or member 25, has a jointed connection at its inner end with a crank 26 below the plate 11, and is formed or provided with a lateral arm 27.

The crank 26 is mounted on one end of a short horizontal shaft 29, which is j ournaled in a bearing attached to the under side of the plate 11, and is provided at its opposite end with a worm gear 30, meshing with a worm 31 on the spindle 3.

The member 25 is formed or provided with a bearing plate or extension 33, which loosely rests on the upper side of a friction wheel 34 on a shaft 35, extending obliquely upward therefrom toward the arm 4 and provided at its opposite end with a friction wheel 36. The friction wheel 36 normally engages on the upper side with a friction segment or member 38, attached to and movable with the arm 4.

At the end adjacent the friction wheel 36, the shaft 35 is supported by a downwardly yielding spring bearing arm 39, which is fastened to the under side of the board or plate 1. At its opposite end the shaft 35 is supported on an adjustable cone pointed bearing screw 40, which is threaded in a bracket fastened to the under side of the board or plate 1. The hooked brake releasing member 25, which rests loosely on the friction wheel 34 and rocks vertically thereon when it is reciprocated lengthwise by the crank 26, is adapted to be swung horizontally by the engagement of its lateral arm 27 with a fixed pin 41 projecting clownwardly from the plate 11, into position to engage with the projection 15, and disengage the detent from the shoulder in the slot 16,

I thereby releasing the brake and permitting its application by the spring 18. The lateral oscillatory movement of the member 25 toward the projection 15 on the detent, is limited bya fixed pin 42, projecting downwardly from the plate 11.

In Fig. 2 a record disk 44 is shown in position on the turn table 2.

In the operation of the stop mechanism, a record disk having been placed on the turn table, as shown in-F 2, and the stylus 5 entered in the outer turn of the spiral record groove, the brake is released and the machine is started by theoperator turning the handle arm of the lever 20 to the right, or clockwise, into the position shown in Fig. 1. The projection 15 on the detent 14, engaging with the shoulder in the slot 16 of the plate 11. holds thebrake in its released or off position until the'detent is-disengaged from the shoulder, as hereinafter explained.

aevolutionaofathe crank- 2 in the direction indicated by arrows on Figs. 2 and 5, the member 25 is reciprocated lengthwise, riding loosely and rocking vertically upon the friction wheel 34. As the stylus traverses the record groove, swinging the tone arm 4 slowly toward the center of the turn table, the friction segment 38 in engagement with the friction wheel 36, slowly rotates the shaft 35, turning the friction wheel 34 in engagement with the bearing plate or extension 33 of the brake releasing member 25, thereby tending to shift said member away from the stop pin 42 and out of operative position for engagement with the projection 15 on the detent 14, as long as the tone arm 4 moves toward the center of the turn table.

With each reciprocation of the member 25, as the crank 26 traverses the lower part of a revolution, the hooked end of said member is tilted upward, as indicated by dotted lines in Fig. 5, and the arm 27 engaging the fixed stop pin 41 just after the hook has passed the projection 15, shifts said member laterally toward the stop pin 42 into operative position for engagement with the projection 15 on the next reciprocation of said member, as soon as the stylus reaches the end of the record groove and the inward movement of the tone arm 4 is arrested. When this occurs, the rotation of the friction wheel 34 being arrested, and the member 25 resting thereon in operative position for engagement with the projection 15, as shown in Fig. 3, on the next movement of said member toward the center of the turn table, the hook engaging with said projection trips the detent 14, thereby releasing the brake, permitting its application by the spring 18, and stopping the machine.

WVhen the tone arm 4 is swung outwardly for changing a record disk or repeating a record, the friction wheels 36 and 34 being rotated in the reverse direction to that indicated on Fig. 4, it shifts the member 25 into operative position against the stop pin 42, but with the initial movement of the tone arm 4 inward for entering the stylus 5 in the outer turn of a record groove, the hooked end of the member 25 is shifted away from the stop pin 42 out of position for engagement u ith the projection 15 on the detent 14, and while the stylus is traversing a record groove and the tone arm with the stylus is moving toward the center of the turn table, it will be alternately shifted into and out of operative position by the engagement of the arm 27 with the stop pin 41 and by the engagement of the friction wheel 34 with the bearing plate 33, until the movement of the friction wheel 34 is arrested when the stylus reaches the end of the record groove, there- 'by leaving the member 25 inoperative position for engaging the projection 15 "and Various modifications in the construction and arrangement of parts of the mechanism may be made without departure from the principle and scope of the invention as defined in the following claims.

I claim:

1. In an automatic stop for sound reproducing machines, the combination with a brake, a spring tending to apply the brake, a detent for holding the brake in off position, and a reciprocatory and oscillatory brake releasing member movable into and out of position to engage and trip the detent and having an actuating connection adapted to periodically shift it into operative position with the rotation of the record, of a friction member connected and movable with the stylus arm, and friction wheels mounted on a shaft, one in engagement with said friction member and the other with the brake releasing member, and tending to shift the brake releasing member out of operative position while the stylus traverses a record groove.

2. In an automatic stop for sound reproducing machines, the combination with a brake, a spring tending to apply the brake, and a detent for holding the brake in off position, of a reciprocatory and oscillatory brake releasing member movable into position to engage and trip the detent and having a lateral arm, a crank having a jointed connection with the brake releasing member and an actuating connection operated by the rotation of the record, a fixed stop arranged to engage the lateral arm of the brake releasing member and to shift said member into operative position with each revolution of the crank, and means operated by the movement of the stylus arm and tending to shift the brake releasing member out of operative position while the stylus is traversing a record groove.

3. In an automatic stop for sound reproducing machines, the combination with a brake, a spring tending to apply the brake, and a detent for holding the brake in off position, of a reciprocatory and oscillatory brake releasing member movable into and out of position to engage and trip the detent, a crank connected with said member and having an actuating connection operating with the rotation of the record, a friction member connected and movable with the stylus arm, and friction wheels engaging the friction member and brake releasing member and mounted on a shaft having a 1yielding bearing adjacent the friction mem- 4. In an automatic stop for sound reproducing machines, the combination of a brake lever, a detent pivoted to the brake lever for holding the brake in 0H position, a spring connected with the detent and tending to shift it into and retain it in operative position for holding the brake in off position and when the detent is released to apply the brake, a manually operated controlling lever pivoted concentrically with the brake lever and having an arm arranged to engage with the detent adjacent its free end for releasing and applying the brake and a lug adapted by engagement with the brake lever to shift it into ofl position, a reciprocatory and oscillatory brake releasing member movable into and out of position to engage and trip the detent, means for imparting a longitudinal reciprocating movement and a horizontal oscillating movement to said member, as the record is rotated, and

means tending to shift said member out of operative position while the stylus traverses a record groove and until it reaches the end of the groove.

5. In an automatic stop for sound reproducing machines, the combination with a brake, a spring tending to apply the brake, and a detent for holding the brake in off position, of a hooked reciprocatory and oscillatory brake releasing member movable into and out of position to engage and trip the detent and provided with a lateral arm,

a crank having a jointed connection with said member, a worm gear and 'worm for operatively connecting the crank with the turn table spindle, a friction member connected and movable with the stylus arm, friction wheels mounted on a shaft, one in engagement with said friction member and the other with the brake releasing. member and tending while the stylus traverses a record groove to shift said releasing member out of operative position, and a fixed stop with which the lateral arm cooperates on each revolution to shift said member into operative position after its hook has cleared the detent.

In witness whereof I hereto afiix my signature.

OLE o. sToRLn. 

